So many of the selections that great DJs make are curveballs and surprising choices. This is less true in more samey genres, but true pioneering selectors will tend to surprise you with their taste and juxtapositions in a way that's hard or maybe even impossible to really capture in an algorithm.

Put another way, even in something as simple a song selection, the weirdness and contingencies in human creative decision making is a feature not a bug.

The efficiency and cleverness of algorithms can create create great powerful recommendation engines but there's nothing like the idiosyncrasies of a person as a curator.